6,091 research outputs found
Backpropagation Artificial Neural Network To Detect Hyperthermic Seizures In Rats
A three-layered feed-forward back-propagation Artificial Neural Network was used to classify the seizure episodes in rats. Seizure patterns were induced by subjecting anesthetized rats to a Biological Oxygen Demand incubator at 45-47ºC for 30 to 60 minutes. Selected fast Fourier transform data of one second epochs of electroencephalogram were used to train and test the network for the classification of seizure and normal patterns. The results indicate that the present network with the architecture of 40-12-1 (input-hidden-output nodes) agrees with manual scoring of seizure and normal patterns with a high recognition rate of 98.6%
Energy Controlled Edge Formation for Graphene Nano Ribbons
On the basis of first principles calculations, we report energy estimated to
cut a graphene sheet into nanoribbons of armchair and zigzag configurations.
Our calculations show that the energy required to cut a graphene sheet into
zigzag configuration is higher than that of armchair configuration by an order
of 0.174 eV. Thus, a control over the threshold energy might be helpful in
designing an experiment for cutting a graphene sheet into smooth edged armchair
or zigzag configurations
Origin of multiple band gap values in single width nanoribbons
Deterministic band gap in quasi-one-dimensional nanoribbons is prerequisite
for their integrated functionalities in high-performance molecular-electronics
based devices. However, multiple band gap values commonly observed in the same
width of graphene nanoribbons fabricated in same slot of the experiments
remains unresolved, and raise a critical concern over scalable production of
pristine and/or hetero-structure nanoribbons with deterministic properties and
functionalities for plethora of applications. Here, we show that a modification
in the depth of potential wells in the periodic direction of a supercell on
relative shifting of passivating atoms at the edges is the origin of multiple
band gap values for the same width of nanoribbons in a crystallographic
orientation, although they carry practically the same ground state energy. The
results are similar when calculations are extended from planar graphene to
buckled silicene nanoribbons. Thus, the findings facilitate tuning of the
electronic properties of quasi-one-dimensional materials such as bio-molecular
chains, organic and inorganic nanoribbons by performing edge engineering.Comment: 11 pages, 6 figure
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